[tbb-bugs] #21766 [Applications/Tor Browser]: Tor Browser based on ESR52 with e10s enabled crashed whle trying to download a file

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#21766: Tor Browser based on ESR52 with e10s enabled crashed whle trying to
download a file
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Very High                            |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Critical                             |     Resolution:
 Keywords:  tbb-7.0-must, ff52-esr,              |  Actual Points:
  TorBrowserTeam201703                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4
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Comment (by arthuredelstein):

 If I comment out the lines
 {{{
     var result = prompts.confirmEx(chrome, title, app+note+suggest+" ",
                                    flags, launch, cancel, "", dontask,
 check);
 }}}
 from `external-app-blocker.js` then there is no crash (and no dialog of
 course).

 I'm not sure why this is crashing, but I have a hunch it is running in the
 child process and wouldn't crash in the parent process.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21766#comment:3>
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